ProgramNode(0...5)(
  [],
  StatementsNode(0...5)(
    [CallNode(0...5)(
       CallNode(0...1)(nil, nil, (0...1), nil, nil, nil, nil, 0, "a"),
       (1...3),
       (0...0),
       (3...4),
       nil,
       (4...5),
       nil,
       1,
       "call"
     )]
  )
)
